Iqbal
I dont agree with 'Nil Ghai' being considered as sacred only folks I know who dont kill them are Bishnoi community in Rajasthan and Haryana. They generally dont kill any animals or cut down trees ( wish there were more of them honestly). My uncles have land in Sirsa/Hissar area and they used to in by gone days hunt Nil Ghais a lot - only bad thing was that hunters would mow down a herd and only pick young calves meat. Even in northern Haryana and Punjab area there are lot of Nil ghais but issue is average farmer doesnt have license for a gun and hunting is illegal. A member here owns a farm there and he can better shed more light but I have seen the damage first hand by these animals and wild boars. I also believe the numbers of animals sometimes are exaggerated by Forest department but rich and powerful still hunt some how.

Now in regards to Indo Pak border in Punjab and Jammu&Kasmir the wire fencing has created a barrier of sorts on Indian site and in some places they have mines laid down or wires are electrocuted, area is patrolled heavily. Even villagers have to take permission to go and plow their fields therefore this should have affected animal migration at the same time no mans land provides a sanctuary to the animals.
Not sure where you hunted my mothers family is from Narrowal and her village is actually further near Ravi river hopefully one of these days common sense prevails and folks could cross the border to shoot some guns in Pakistan ( Prohibited Bores PB) weapons and folks can come to India to enjoy some PB brew ( Prohibited Brew)LOL. Also I wonder if cross border firing due to some hunters on the other side and Border Security Force ( BSF) guys retaliating LOL.
On a positive note recently in Harike Pattan ( in Punjab India where rivers Beas and Sutlej converge) they sighted endangered fresh water dolphins .